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If you are looking for an extra layer of protection for your trailer, then the Alarmed Stainless Steel Trailer Hitch Lock might be what you need. This heavy-duty lock fits perfectly on most types of couplers, with the exception of newer Bulldog types that clamp on the ball from the side. It is made of high-grade stainless steel and has a tight tolerance, making it difficult to break open. The lock is also designed to protect the bolts from cutting and other tampering. One of the features of this lock is the 120dB alarm that goes off when someone tries to tamper with it. However, based on customer feedback, the alarm may not always activate and the key may not deactivate it. Some customers have resorted to removing the battery and using it as a lock only. Regarding sensitivity, the alarm does not go off during normal trailer movement while you are inside the trailer. It is recommended to keep it on your trailer while parked in campgrounds or at home for extra security. However, if you bump or jiggle it with your hand, it will activate the alarm. Overall, the Alarmed Stainless Steel Trailer Hitch Lock is a solid choice for those looking to add an extra layer of security to their trailers. While there are some issues with the alarm function, the lock itself is sturdy and difficult to break open.